This is yet another new page or link that is part of Chapter 10
The numbering of the Chapters can be done in any manner. But, by number in increments such as 10, 20, 30, etc. you can later insert pages, or links, as needed within the existing pages.
There is no limit to the number of pages, or links, that can be grouped together using the Chapter.
The display of the Previous/Next and TOC listing is a setting that can be turned on or off.